You do a great job. I dont know if it would help, but investing in a second monitor might help. You could have twitter on one monitor & FR on the other. That way you wouldnt need to minimize Twitter or FR & could work directly from one to the other.
Or, with one monitor, you could post from Twitter into a Word document & then when you have it all posted & your formatting, transfer from Word to FR. It might be easier to lay it out in Word, rather than in that tiny FR box. Of course you couldnt be sure your formatting worked until you previewed in FR, but it might be easier.
Just a couple of suggestions, but again you do a Greereaaaat Job as is!!!